System for air-cooling gas-engine cylinders.



G. E. MARTIN & A. I. SWANSON. SYSTEM FOR AIR COOLING GAS ENGINE CYLINDERS.

APPLICATION FILED MAY 2'7, 1907.

Patented Apr. 27., 1909.

" UNITED sTA Es PATENT oFnIoE.

GEORGE E. MARTIN AND ADOLPH F. SWANSON, OF CHAMPAIGN, ILLINOIS.

V sYsTEM son Ara-comma as-Enema CYLINDERS. f

To all whom alt may. concern:

Be it known that we, GEORGE E. MARTIN and ADoLPH 1 Swanson, citizens of the United States, residing in Champaign, in the county of Champaign and State of Illinois, have invented certain newand useful Improvements in Systems for Air-Cooling Gas- Engine Cylinders, .of which-the following is a full and true description, such as will enable others skilled in the art to which it appertains to make use of the same.

Our' invention relates to gas engines and has particular reference to air cooled gas engines.

More especially our invention may be de.

nominated a system, for air-cooling gas engine cylinders.

' The objects 'of our invention are to rovide a cylinder for gas or internal com ustion engines which shall have greater radiating properties than similar cylinders now on the market; and to equip the same with a 1 cylin er of the engine being shown partially in section, and Fig. 2 is an end elevation of the engine shown in Fig. 1.

Referring to the drawings, 1 indicates the bed or frame of a gas'engine of which 2 is the cylinder, 3 the piston, 4 the crank shaft and '5 the flywheel. .,The explosion end of the.

cylinder is provided upon its outer face with a large number of long slender ins 6. These are cast integrally with the cy inder and are coextensive with the explosion chamber thereof. The pins 6 present a large exposed 45 A 'thus maintaining the cylinder at a much surface of 'metal for the radiation of heat,

lower temperature than would otherwise be possible. We know that it is not new to provide a plurality of radial members cast integral with the cylinder for the pu ose of increasing the heat radiating surface ut, as now made these radial-members are comparatively short and thick, as it is impossible with the method of casting the cylinders now,

in V0 efto make them of any considerable lengt We have found that a large num- Specification of Letters Patent. Application filed May 27, 1907. Serial No. 865,605.

Patented April 27', 1909.

her of long slender pins are more el'licacious in cooling a cylinder than are a less number Surrounding the cylinder 2 and extending considerably beyond the explosion end thereof is a jacket or casing 7.. This is preferably formed of light sheet metal and is of but slightly greater diameter than that of the cylinder 2 and pins 6. The projecting end of the casing 7 contains the inlet and exhaust valve casings and means for circulating a current of air through the casing about the cylinder. The latter comprises a fan 8 mounted upon a short shaft 9, journaled in the head of the cylinder, or in the casting 10 which constitutes the valve casing. The fan 8 is driven from some moving portion of the engine. In the preferred form as illustrated in the drawings, it may be driven from the rim ofthe fly-wheel. Upon-the end of the shaft 9 is a pulley 11, which is connected by a belt 12 to a similar pulley 13 fixed upon the end of a shaft 14. The shaft 14 is journaled in bearings 15 which may be arranged upon the jacket 7 as shown. Upon the opposite end of the shaft from the pulley 1,3 is a friction roller 16, which bears against the rim of the fly-wheel. It is evident that when the engine is running a current of air will be rapidly circulated through the jacket 7, by means of the fan 8, and t iat the jacket 7, by being but of sufficient diameter to. receive the cylinder 2, a lar e quantity of cold air will be made to circu ate rapidly among the pins 6, consequently carrying off a great amount of heat. By keeping the cylinder 2, and pins 6, constantly surrounded by a volume of cold air they rapidly give off their heat, especially the long slender pins 6. It is obvious that the longer and more slender the pins 6 the greater will be the radiation of heat.

Having described our invention what we claim as new and desire to secure by Letters Patent-is;

In an internal combustion engine, a cylinder having a plurality of long slender pins extending radially from the side walls thereof,

. ranged in the end of said jacket and journaled i said end being closed y the usual head, a set our hands,

' engage the rim of the fly wheel, substantially as described.

In testimony whereof, we have hereunto this 17th day of May, 1907, in 5 two subscribing witnesses.

GEORGE E. MARTIN. ADOLPH F. SW'ANSON.

and the usual fly wheel, combination with a cylindrical jacket arranged about said cylinder and extending be 0nd the end thereof,

valve casing formed in said head, a fan arthe presence of on said casing, a shaft bracketed upon the side of said jacket, suitable connection be--, tween one end of said shaft and said fan for driving the latter and a friction wheel on the opposite end of said shaft and arranged to lVitnesses:

FLORENCE CHARLES, LILIAN L. GULICK. 

